Last year I stumbled across this twitter post which presented the idea of marking scanned documents, like IDs, as classified. In the snippet, the author used
convert (ImageMagick) to do this and that's the way that I've been doing it since I adapted the idea.
In this post I present the same idea but using a simple p5js/HTML code. Once the image is submitted a canvas is created and the text is applied over the image. Then the image is available for downloading.
An example of the rubber stamp (the low image quality is because of the dithering I apply to all images):
Note: no uploaded image is stored in this server!